Earlier quoted context omitted.
I would recommend removing "bro" from your lexicon, at least how you used it here. It comes across as aggressive and immature. Not a huge deal, but you'll get better results in life without it.
I would also recommend you not lecturing other people and posturing as if your superior. The way you said it puts yourself above him and is condescending to him directly. You don't lecture strangers this way so why do it here? It's because you're protected by anonymity. You know what you say can piss people off but you say it here because the consequences are minimal. It's ironic because an outside observer sees what…
1. This person is asking us to use/try their product. Very different from a boss/subordinate relationship.
2. This is Hacker News, which has a certain tone and intention. I might text in lowercase and slang with my friends, but I try to write a little more thoughtfully here. This is just one person offering advice on presenting yourself when presenting a product. Not to mention that they politely hedged - "not a big deal", "I would recommend", "it comes across". The OP is free to disregard.