The question of whether m/m is "gay" is entirely beside the point. It's just a question of personal taste.
For most of us here, tickling has (or at least can have) a sexual element. Personally, I don't like pictures with guys in them, simply because I don't want other guys intruding into my fantasies. That's why I prefer f/f over m/f, and only like m/f when the guy isn't too prominent. F/m interests me, pretty much, only when I'm the m... seeing other guys in the pics kinda kills the attraction for me.
Still, just as I, a male, like f/f, I can see where females could like m/m for similar reasons. Gay men may also be an audience for m/m, and there are clearly straight men who also like m/m for their own reasons. Given all this, anyone -- like me -- who does NOT like m/m can simply not look at it. There's no reason not to produce or post it just because some, or even most, don't like it. After all, I don't like most m/f, but I don't go around insisting that it not be posted.