Remember Kids:
Don't gatekeep or harass people about the tools they use!
It's okay to gently offer a suggestion and ask their reasoning for using something, but constantly bugging them to use "X" or making them feel bad for using a thing that works for them is not good!
Let people use the tools that they know, work well with, and work well for them! Don't be an asshole!
But I would like to say, if at all possible, especially in the FOSS space, we should try to guide people away from using things that are built by bigots, abusers, transphobes, etc, those projects don't deserve the support.