People with no filter mouth

Normally when I reached office every morning, I will greet anyone passes me cheerfully. Why come to office look with grumpy face RIGHT?
Anyway...I was at the pantry making my morning coffee when one of my female colleague came to get some water. I complimented her nice dress and suggested that she should wear more dresses as she look very womanly and nice. She was happy that I compliment her. Then this colleague guy (moron) suddenly ask me not to tell lie to her. Seriously, I told him off..."I'm just being honest and I compliment when I do feel they are deserve to be compliment". Not sure why this guy always need to be so crude and hurtful even we NOT talking about him. Geessshhh!! This guy always like to say mean things and think it is fun....seriously you are already mid 30s. If you have nothing good to say.....SHUT UP le!!!