Male homosexuals are the highest risk group, and are targeted for screening. MSM is a recognised abbreviation.
Bisexuals are also high risk and targeted.

Lesbians are not a risk group.

PHE.
" Get tested regularly for HIV if you are one of those most-at-risk:
a. Men who have sex with men are advised to have an HIV and STI screen at least annually, and every three months if having unprotected sex with new or casual partners."

National Aids Trust (NAT)
"NAT want to see a change in testing culture in the UK. 'At least annual' testing must become the norm both for gay and bisexual men"

These statements contradict your statements that "Nobody, I repeat, nobody is calling for any HIV testing on anybody on the basis of being gay."   and,

"There is nothing, nothing whatseover to substantiate a campaign focussing on gay men. It is homophobic to do so."
.
Let's be more careful with our wording to avoid this kind of disagreement.