Don't know if I am the recipient for this remark. I do wear this kind of looking shoes. Are they comfortable ? Yes. Professional looking ? Maybe not. It always makes me smile at the fashion police trying to establish that this is the way to be a professional pilot. Not a word about somebody who is up to date with current procedures, who has opened the books a little more often than 2 weeks prior to upgrade, or 2 days prior to a PC.
This kind of professionalism is what you owe your passenger, your family and yourself.

BTW, If I am indeed the recipient, either tell me my shoes don't look professional (when we fly) or don't even mention it on a public forum. That's also professionalism.