A friend of mine put high income requirements on her online dating filters, and I felt decidedly negative about it. I said to her, what's better a guy that earns $40K and spends $20K each year, or a guy that earns $150K and spends $155K a year?! It isn't the income that supports investing goals like his, but spending habits, IMO. Her response was something like "true, but..." IDK, she just acknowledged my point, but didn't think much of it.
So, yeah, this move annoys me for sure. She says it is because she wants someone who can take care of himself, but the logic doesn't follow. Also, I felt it was really stupid of her to exclude someone that would be a great partner based on salary. If she applied the same rules to her friends, I wouldn't be one of them. If I applied the same rule to my spouse, who is an amazing partner for me, he wouldn't have made the cut. Lame idea, IMO.
She actually may have changed it. She was dating a guy that was FI, but too frugal for her tastes. They started dating prior to him leaving his job as a lawyer, so his six figure income made the cut off. Then he quit working, and didn't have the money to wine and dine her like she wanted him to. Her new guy makes considerably less, but is kind of a minimalist and isn't really spendy. And they get along way better than her last beau.
I would caution your friend that he might be filtering out a potential great love by setting income requirements.