I have seen rudeness but the offenders were removed some time ago. (Quick thank-you to the admins.) Sometimes I think we need to get a feel for the members here, their experience and desire to help before judging.
One thing for sure, if someone asks for help they will receive really solid and helpful advice. I am on a couple FB groups that I am thinking of leaving as the advice is often awful and/or rude.
Before getting offended because advice was not asked for or what one wanted to hear, perhaps consider the experience level of the responder, why it was offered and if it could be true/helpful. Just my thoughts, take ‘em or leave ‘em.