If it’s just one person that isn’t a fan of you...then it’s no big deal. No matter who you are and what you do and how great and nice you may be, someone will always not like you. It’s just life. There are haters and those easily offended and those that are always negative. Can’t really change that. Unless over half the shop is shunning you, I think it’s nothing. It’s not really a problem unless that one person purposely treats you poorly and unprofessional when it hasn’t been warranted or its your direct supervisor. If it’s just one random NCO...forget him. It’s almost Liftmas bro! Get to the gym and get big before all the noobs start doing the weight machines backwards in January.