This is a little risky as it may come out somewhat vain, but I'm going to go out on a limb here and say that men in sweaty white gym shoes like the below, are a massive turn OFF.
White gym shoes should only be seen in the following circumstances:
1.Emergency outside shoes used for either collecting the mail, sweeping excess water from backyard during floodings or gardening.
2.For gym/walking/ excercise etc
And lastly 3: For those circumstances where you're asked to wear an outfit that you wouldn't mind getting dirty. That is when your old t-shirt, tracksuit pants and those nasty shoes come out to play- then and ONLY then.
Ok, so it's a little harsh to judge a person on their shoes, but if you're male and reading this, trust me when I say that you will become exactly 100 percent more attractive if those things (said shoes) are only worn in the 3 circumstances listed. Trust me ;)