I board with mature adults. There is no "showing up" of anyone. Plenty of respectful advice and assistance though.
When my horse needed to stand for 45mins while his pads set up, my BO showed me a massage technique that turned my wiggle worm of a horse into a completely calm, half asleep horse that snoozed until the farrier was done. Was she thinking "oh hey, I sure showed her!".... no, more like "Yay, that worked and with any luck we won't be standing out here, freezing our butts off, doing that again".
Nobody knows everything. We had a very high level rider visit the barn and she accidentally put boots on the wrong legs of the horse she was going to ride. I didn't "show her up" but I did quietly mention that the boots needed to be switched and later on that day she gave my horse a free training ride. Highly doubt she would have been so inclined if I'd snottily pointed out my superior knowledge in boots.
Nobody likes an insufferable know-it-all and the more you attempt to lord your supposed "superior knowledge" over them, the fewer friends and opportunities you will have in life.