Sure, but people aren't obligated to help you, especially if you're not paying them. I do think that in an ideal world, just asking should never be a problem as long as you're not pushy or entitled. But a lot of people are tired of constantly educating others about their identity, so it could be easily seen as 'expecting marginalized people to educate you' or 'being entitled to a marginalized person's labour'.
If you happen to get the all clear from one person, that doesn't necessarily mean you're completely off the hook either. No group is a monolith, and just because one person doesn't see anything problematic, doesn't mean others won't. And asking a second person to check over your work can honestly feel like asking too much.
Sometimes it's not about ego; it's about being afraid to burden others (and not have the money to pay so that it's not a burden).
I do feel like sometimes if your from Marginalized Group A, you're expected to accurately represent the completely unrelated Marginalized Group B even though there's no reason you'd be any more informed about them than the white cis guy. Maybe it's a 'do unto others' kind of thing? As in, 'if you don't represent our group well, don't complain if someone don't represent your group well'?
Basically, I think this is all we need. People should be allowed to insist. But they should also warn folks ahead of time if they do.
(Just for the record, I'm not intimidated or offended by research; I do in fact try to do it myself. But the only reason why I can put aside my fears of 'is it enough' and just publish the darn thing is because I believe it's okay to put out work that may hurt others, as long as you put out a warning so people can avoid it. I can never confirm for certain that it's 'enough'; I have to just be okay with it not being 'enough'.)