LGBHT: Why don't heterosexuals realize that calling themselves''straight'' is offensive towards gay people, whom are 50% of the population?

Don't wanna be eliminated from the LGBHT as of LGBT?Stop calling yourselves straight, if you don't i'll keep calling you cisgender, which is not even comparable to the word straight, which means firm, and thus very homophobic term. Cisgender, or just cis, on the other hand, just means not trans. Also, most heterosexual people do not call themselves straight, they just call themselves what they are, hetero, heterosexual,ect, deal with it!