Absolutely. Attacking users solely based on their negative experience with Fediverse is totally inappropriate and doing so makes the local user base seem elitist and hostile towards newcomers. If someone is being disrespectful, it’s their behaviour that should be addressed, not the fact that they came here from Reddit or any other platform.
I’d say that phone/face verification is an overkill. Moreover, as you have already mentioned not everyone would go for it. Especially the kind of people who like Fediverse and open-source software in general will be more wary of such practices in general, I suppose. I’m not a fan of such practices myself because I care about privacy and the proposed tactic really reminds me of mainstream social media.
I think that so far the verification system works just alright. Being verified by a small text while signing up works. Using the same pseudonym and contributing to the community with quality content and decent comment history to build yourself a positive reputation also does.