What's the right way to give feedback to creators about their product?

Hey PH community, I came across a really cool tool on PH and wanted to test it out for my company. As always, I signed up with few other competitors, including this one, to compare and see which one is the best fit. The product in questions looks really promising and cool. However, everything went downhill after the sales call was set up. The person scheduled to do the demo was late for the call, didn't even bother apologizing and did the demo, assuming my team present on the call are a bunch of dimwits who have no idea of how things work. The agony compounded when instead of focussing on the product's features, the said person spent more time making a case for how their product is better than their competitors. The product is really good, and I hope it gets big; I was convinced about it even before the demo, but the whole experience makes me not want to give my money to them anymore. I want the product to succeed, but I really want to let the founders know that they have a terrible salesperson potentially destroying their product's future. What's holding me back from giving feedback? 1. I don't want to jeopardize this person's position at the startup, given how tough things have been on people in startups over the last year 2. I don't want to leave a negative review on the PH page or Twitter because I feel there is nothing to gain out of it except to let the creators know. However, I do know making the review public will scar their product's profile 3. Reaching out to Founders privately via email or Twitter DM still creates the risk for 1 Would love to hear the communities thought on what's the best way to handle this? I am leaning closer to just letting it pass.