This is my personal opinion and it might not reflect the wider community's. I'm not even giving a straight answer, just some points to think about ^^

First and foremost Pride isn't a singular event. Some are more celebratory and family friendly. But imho it's original purpose is a protest and protests aren't subject to the same rules as other places and times. e.g. you don't tend to shout in the street everyday.

Secondly this rule as an absolute doesn't make a lot of sense. Even without critiquing the wider society's rules a choker isn't the same as a full puppy outfit. (and tbf I don't see the issue with pups, it's just dress up ¯\_(ツ)_/¯)

Lastly, I personally find that view kinda rooted in puritanism. Why should it be shameful in the first place? It kinda has "don't ask don't tell" vibes.

Lastly, how do you precisely define what's a kink and what's not?