How do I deal with aggressive "know it alls" when selling my mare?

I have a very docile timid lovely mare (Morab). She is so tame, a kids horse, you just tack her no ties or anything needed, jump on her back and ride. She prefers to mosey around yet can and will pick up the pace on cue. My son who has not ridden a horse in 4 years had no problem handling or riding Lila, the entire barn loves her, I love her. I am sellling her as I bought her for the kids (and friends) to join me in trail riding and well, while I was borrowing horses last year, no one is interested this year.

Lila is timid, the low gal in the herd, very gentle, docile, so easy. She is a good and sturdy Morab but acts like a timid little kitten.

My issue: I had a "professional trainer / horsewoman" come to see Lila the other day. She helped catch her in the field which is so easy Lila comes right up to you, walked her to the barn again, so easy, tacked her again so easy.

Then we proceeded to the ring.

She started getting really rough with Lila and Lila was scared to death. She took my dressage whip and first touched her all over (no issue), walked her around (no issue), pushed her around (no issue), the (gasp !!) went at her like she was stabbing her with the dressage cue, took my longe line and started whippin her around the back end.

Lila is super docile no need to rough up the horse, she is so submissive. Lila started to act like her right leg was broken (before it was her left leg with a previous interested rough horseman), swished her tail back and forth, refused to do whatever she was trying to get her to do (duh I really have no idea as both my horses, you just jump on and ride). Lila kept her eye on her and kept backing away while this Professional clucked whipped and stabbed (how Lila perceived the entire event) attacking her.

Well, she then said "oh, this mare is not trained, all my horses are worked like this, not tame or ready to ride, I won't get on her back - I can tell right now she is not right for MY riding program"

I said "OK, nice meeting you" and she pressured me to ride Lila. So, well I jumped on and off we went, a nice slow walk. She said "are you going to ride her with you lead rope on your saddle, she is going to kill you", and "are you going to carry that dressage whip, she isn't trained".

Well, I was really pissed by now, and I jumped on my horse and we went into a nice walk on the rail, very nice extended even sweet walk.

She then asked me if Lila leg cued and I took my (bad) right and left leg and showed her Lila's "buttons".

She then asked me if Lila voice cued and I said "trot" and Lila picked up a trot. I then said wooah and wait and back, and Lila did all 3 beautifully

She then wanted a ride, I was done with this lady but thought well, perhaps ....

She jumped on and Lila gave her a very nice ride.

She said "OMG, I am so shocked such a not submissive hores on the ground rides so nicely under sadle"

Duh. I told her Lila is scared of getting stabbed jabbed whipped and well, I am "new school" and was taught if the horse is submitting and cooperative, no reason to be rough with her.

She really upset me - so much I ended up leaving my saddle and tack at the barn (my manager held onto it for me)

Q: WHAT DO YOU DO - with those heavy handed "experts" that want to whoop the crap out of your little puppy / kitten of a horse that is so cooperative sweet and docile when you say "PLEASE DO NOT DO THAT TO MY HORSE" and the go ahead as they are "EXPERTS"

End of story, she said "oh, market her as a kids horse".

Duh, that is how she is marketed, as a very loving docile kids horse that is very willing, prefers to go slow but will pick up the pace

She also criticized my horse for not just going "round and round" without" being cued or shall I say, ridden.

I told her I train and expect my horses to wait and do nothing until I say or cue them to move, stop when I cue or say woah, turn right when I turn the right not just go on thier own, turn left of go left when I cue them not just go on their own

This "Expert" seemed to think my horse should just go round and round without any cues.

HELP

What would you do with someone like this?

I don't want to ever meet this type of person again nor have them "attack" my sweet docile cooperative loving horse.

HELP is much appreciated. This is second horse I have owned first I have sold and it is killing me emotionally as I love her and want her to go to a good home, do not want her to feel attacked or roughly handled, gosh knows that is why I bought her, she is so docile and submissive - no need to attack the "beast"

Thank You