I am using the terminology you used in the OP

I understand why you feel like this. I use the word 'fetish' just so you understand what I'm talking about and trying to say. Does not reflect my actual opinion about it. Sorry if that's confusing, I'm replying to a lot of comments and it's hard to keep track of it all.

"It would be great to fuck two chicks at once, since you're bi we should have a threesome. Your friend Jenny is really hot, you should ask her. A threesome with a guy? What? Fuck no, I'm not gay! I won't be in the same room as a naked man, no less touch one."

I mean the conversation can turn gross really quickly. THAT is unacceptable. I never said he phrased it well. I can totally see where that would cross a line and I am NOT in support of that. My argument rests solely on the desire for a straight man to be with more than one woman, and the fact that you can have this conversation without it being an issue (i.e. regardless of sexuality).