How would you react to a gay person who found you TOTALLY repulsive ?

[Pyrrho]

As a general rule, I do not tell people who I find repulsive that I find them repulsive.  There is generally no need to do that.  The world has more than enough unpleasantness in it already, so why add more that serves no purpose?

 Absolutely.

A few others here have expressed similar sentiments, and I'll add my voice to it.

There is ZERO need to express a negative opinion on something unless:

A)  You were specifically asked for your opinion

B)  You're a professional movie/art/food critic, opinion columnist, or Judge, and it's your job to pass an opinion on that specific thing

C)  The thing upon which you are expressing your opinion is in some way not merely unpleasant to you,
but OFFENSIVE or damaging in some way, and something needs to be said.

D)  You are participating in a forum or blog where people specifically come to air opinions, whatever they may be...
...and even then, as Pyrrho pointed out, there's really nothing constructive being accomplished by offering a gratuitously negative opinion
on something that is hurting no-one.

I slightly disagree with what you have stated.  I think in the case of something put out for public display, like a movie, it is fine for people to express negative opinions of it.  But the personal appearance of people who do not put themselves on public display, is a matter that is normally best left alone.  Just to be clear, going to the store to get a loaf of bread, although one is then in public, is not what I mean by being out for public display.  One is then out for a loaf of bread, not someone shouting "look at me!" to the world, as is effectively being done when one makes a movie.  If someone chooses to be the focus of public attention, different rules apply than to those who do not make that choice.