What does it mean when a guy call you small?

Okay this happen to me with three different guys at the gym. when I workout i tend to wear a hoodie and sweats, however I tend to take off my hoodie if I get too hot. They’ve never said it to my face they were always talking to a friend; “she small” or “I didn’t think she was that small” “I never realized how small she is” and their buddy would be like “yeah” or “I told you” . As someone who is trying to gain mass and muscle, I will admit I felt insulted but I didn’t understand what they mean by small, am I not gaining any muscle? If anyone wants to add their 2 cents to make this 1.98 a whole 2.00 much appreciation
What does it mean when a guy call you small?
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