Nothing quite grinds my gears like being an expert, or close to expert, teaching someone else, and then coming back later and them giving pointers on how you could be doing better.
Some of this is warranted and some is just dumb pride. It doesn’t feel good to be “taught” by someone you feel is inferior to you. It feels like they’re talking down to you.
Something you have to learn is to be gracious when receiving criticism and advice. That doesn’t mean that you follow and do everything everyone ever tells you to do, it simply mean always being willing to listen to it.
That person that you taught, maybe they are giving you great advice that you could gain from, maybe it’s something dumb that you know would fail because of your years of experience. But if you go into it with an already closed mind because you are annoyed they’re even bringing it up, you stand zero percent chance to learn from it.
The truth is, sometimes you might be a better teacher than you are an expert, and you may very well teach someone how to do something better than yourself. Think of that as a huge win and then start learning from them. Don’t get caught up in who’s best, get caught up in how to do the greatest combined good.