The toxicity you see is the pollution of sociopathic ignorance and self-entitlement that tries to insinuate itself into functioning communities, and then eats the talent and the spirit away from the inside out.
In fact, we're welcoming, helpful and sharing. The problem is people thinking they can come here and do whatever they like, and then getting upset when they learn otherwise. The toxicity you are seeing is merely their own bad attitude getting reflected back at them.