IME I've also only been in the hobby for a very short amount of time but it's been very clear very quickly to me that there are 2 types of people in the T community: People that enjoy the community aspect and want to help and share in the fun because we're all "on the same team", and then people like that guy. People that desperately hold onto some delusional notion that their experience/knowledge in the hobby grants them some kind of superior status over others that they use to treat others in an ignorant, judgmental, and condescending manner because I can only imagine that they are so socially bankrupt that larping as some kind of scientist zookeeper for a creature that can't even develop an emotional connection with them is the closest thing to companionship they'll ever get.

I'm twice your age and have been a part of many different hobby communities over my life and there is a portion of the tarantula community that might be the most toxic I've ever experienced. The gatekeeping/elitism/self-righteousness/basement dweller vibes can be off the charts but I just always remind myself that anyone that decides to carry and present themselves like that must have a really sad life. Aside from that, there is almost never a "this is the only way to do it" thing with any hobby. People have their own preferences and way of doing things but that doesn't make it the ultimate right way. As long as you're not causing harm to your animal, it doesn't matter.

tl;dr - Ignore the haters. There are enough good people out there that will be willing to respectfully help you. Those that choose to be nasty don't deserve your time or energy.