You can not fail to hire him for the reasons you stated. But this is silly because unless you were stupid enough to say I am not hiring you because you weigh “near 400
pounds, seldom bathes, stinks to high heaven with BO, and farts all day”, he wouldn’t know why he wasn’t beginning hired.
If you were that stupid, then you deserve to be sued.
What is it about people on this forum that they dislike overweight people? As for people who fail to bathe and sink as a result, no job, no money, no soap, no water, no ability to wash clothes. As for farting all day, hate to break it to you but all humans and many animals fart all day.