Generally speaking people who need mental health help are going to be more easily discouraged by a negative interaction than the general population even if they can afford therapy in the first place. In the US at least there's also a shortage of therapists, meaning you might have to wait a long time to see anyone at all. And in my experience there are a lot more bad therapists than good ones (though assholes of this level are probably rare).

Honestly if it were me I'd just save myself the trouble, read a book on CBT and get some antidepressants. But that doesn't work for everyone.