Wow, if that wasn't condescending!

I get so annoyed when people say mindless stupid things that are irrelevant and just plain ignorant. Let me expound a little bit to you all about my encounter. I went into work today and went to the restroom. Upon exiting the restroom I crossed paths with a fellow co-worker. When this fellow co-worker out of no where pronounces "you dress like a little kid". Granted that my dress was a little colorful today, but honestly i'm 22. This co-worker just showed me their true character, condescending, judgmental, and straight up rude. Not to talk myself up, but at least I said hello! After our short encounter I (like a gentleman) opened the door for this co-worker. When they replied, "I was going to get that for myself", thus proving even more how rude and shallow this person really is. My question is why must people do things like this? Why must people say snarky comments before thinking? People please be RESPECTFUL of everybody, especially fellow co-workers! If it isn't your place to say anything, don't! Thanks for listening to my babble, and let me know what you think?