I don't think it's odd...he might be obese now, but maybe a year ago, he wasn't able to even get out of bed. Who knows. I think the class can suck regardless of his size. I don't think he should have spent 10 minutes telling people how to accommodate a beer belly that they don't have (yet anyway). I think his class sounds totally annoying but maybe it was supposed to be only an introductory first lesson? I would have asked after class if that's how it always is or if the next classes would talk-free. I hope you had a nice brunch.