How tall are you? I'm tall as well. (6 foot)
In this situation, ignore your friend. There is a larger majority of TBs that are hot compared to other breeds, but this in no way implies that all TBs are hot. My TB cross is a beginner lesson horse who has had a 1 year old on his back. He's far from hot. Have you met the horse personally? Were you able to be around him or to see him?