Well, I'm not suuuper picky about my clips, and I know my tastes differ quite a bit from those of a lot of people--I prefer feet only, I love tools, and I adore lickling with a passion--and it would take a lot to make me completely not want to watch a clip, but even I've got my limits.
--When feet aren't the most ticklish part of the body. I know that there are a lot more body parts that can be tickled, and I don't mind if there's a little bit of bodily exploration before the 'ler gets to the tootsies. A little bit. But it makes me sad when the 'ler starts with the feet, then moves on to other parts of the body to greater effect, because I know there won't be any more foot-tickling in that clip.
--Certain foot proportions. I may not be picky about clips, but I am a bit picky about the feet. I don't like long toes, I don't like super high arches, I don't like nail polish (unless it's black, or an unusual color like light green or something). Any of these traits tends to turn me off a bit...
--Super-masculine 'lees. I love me some male 'lees, I really do. I even like male 'lees with beards and six-packs. I do not, however, like male 'lees with hairy-ass potbellies and lumberjack beards.
--Overly-sexualized M/M videos. I don't mind the occasional naked M/M vid, anymore than I mind naked F/F clips. What bothers me, though, is that there are plenty of F/F clips out there that are just playful and cute, without nudity and sexiness, while almost all of the M/M I've seen is of naked guys jacking each other off while they tickle each other. Again, I don't mind those vids, but still, every once in awhile I'd love to see a video of two dudes tickling each other in a playful--and clothed--manner, y'know...?
--Gags and masks. I hate ballgags just... SO much. They look grotesquely uncomfortable and restricting. And I hate those dumb-ass black leather gimp masks they tend to put on guys in F/M videos. I get that it's a dom thing or whatever, but it's just... ugh. Gross. No thank you... XP