I am surprised you've been here so long and still haven't figured that out.
Anyway, while, to me, it's not really disgusting, and I don't exactly mind watching it, I would prefer not to. Since for most guys, tickling is sexual, they think that tickling between two males is considered gay - though, this may not be the case for some, I am just stating what I have read before, and my opinion. Also, the whole, 'girls are brought up with all the hugging, and the touching and stuff like that, while guys are brought up differently, and shouldn't,' or some shit like that. Whatever you wanna believe.
I could watch M/M tickling, but I could never participate in it, as it would just seem too wierd, and I would be uncomfortable. whenever I am tickled by a guy, I try to make it end as quickly as possible, 'cause it makes me so uncomfortable, it's crazy. It even starts to piss me off a little, though I never show it.
Anyway, I did my best to explain it from what I have read on the forum, and my own thoughts on it. People might wanna add other things. I hope I am not completely wrong on this.
🙂