alt Hacker NewsI have yet to meet a front-end dev that gets hostile when you show them how their code can be improved. On the contrary, the folks I have worked with are thrilled to improve their craft.
Unless of course you are not showing them improvements and are instead just shitting on their work. Yes, people do get hostile to that approach.
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Then you and I are talking to different people. Fortunately, I don't work in JavaScript for employment any more. As a frame of reference just the mere mention that a site could be 50-200x faster by dumping React creates conflicts of interests for impacted developers and the results are typically not immediately welcoming. That isn't shitting on anybody's work, especially if you provide guidance for improvement, but if a large group of developers cannot function without React their perception of "shitting on their work" will be less objective.
I take it you've never suggested to a front-end dev that maybe their contact form doesn't need a 1MB+ of JavaScript framework and could just be HTML that submits to a backend.