The weird thing is that I don’t think he gets a lot of negative comments, but if any one person gives him pushback or disagrees he apparently freaks out and blocks them then disables comments.
I only looked and never commented, even when he had asked for feedback, but the one thing I always notice is most (if not all) content is from others, so when people keep asking him about it, he is probably getting sick of it. No excuse to be a dick to anyone about it though, but at least now he credits the person he got it from, so others can direct their questions to that individual, rather than his post.
Maybe I am more of a helper at heart, so would always be a little more keen to explain and inform others with any modifications I make or do, but I guess if you want to run an instagram account like that, you have to be willing to take the good and the bad feedback and the million questions that go with it.
As far as shops selling whatever they can, I have seen it time and time again where people are forced to buy a new set of trucks for something as simple as a broken kingpin as they either flatly refuse to help or don't have the tools for the job. I know the last Indy forged baseplate with hollow kingpin was such a mission to get out, the baseplate was broken and done by the time it came out, so there was not a whole lot that could be done anyway. Luckily I had a spare old baseplate with intact kingpin handy and it was a good customer, so that wasn't such a big deal for me, but I draw the line at removing griptape if it is not the easy peel type stuff.
Give them the tools to try, or tell them how to do it and let them deal with it, but if they can't sort it out, then buying new whatever is about the only other way to keep them rolling.