@Setanta,
Well, if you compare the inverse...a hypothetical action of heteros demonstrating as a group their pride...there'd be a problem, right? Heteros aren't the disadvantaged group, to say the least; whereas gays have been in the past and still are being discriminated against. Lefthandeds aren't ...
redheads aren't (unless it's UK).
... and conversely I see no reason for gays to ashamed either. (I get it that you aren't saying they should be ashamed). And, even though you don't see homosexuality as a detriment, you do recognize there's a large vocal group with power in society that does. Historically, minorities who've been discriminated against by society have used various methods over the last 40-50 yrs to announce their group unity and pride.
As a group for the purpose of group support and unity, demonstrations some chest-beating, of the group's pride is understandable. Socially, at this time in society, many disadvantaged minority groups (Puerto-Rican day in NYC as an example) choose to use media and public to announce their pride in various ways.
As long is it peaceful I've no problem. What harm is there in a minority group announcing self pride?
I am announcing my pride at being a lame punster. Hopefully my permit for which I applied for a parade in downtown Sarasota will be allowed. No one seems to take my cause seriously.