Basically, we don't want to mess up or get embarrassed in front of you, so the easiest way to do that is avoid conversation. Otherwise it will make us look bad but I don't believe in that I just think if your going to talk then do it ha.
Many researchers have examined your very question on why men seem to fail in socializing when compared to women. The most logical answer would seem to be that throughout the pre-maturity ages (adolescence, puberty, teen, and even college years) men rely solely on physical emotions and even spend most of their time relieving these physical emotions through sports and hanging out with the guys (which usually has limited or even 'caveman' like talk "she pretty, I like baseball, me hungry). While women on the other hand find importance in socializing and through this perfect the art of talking.
To better help out your situation, try "leading" the conversation either by asking questions or by taking the bigger share of talking through stories or small talk. Don't get angry for the first few weeks if it seems like he's not paying attention, most men have a really low attention spans and yelling will enforce them to retreat even more into their mindset.
After a few months of "teaching", most guys will catch on to your style of conversation and will mimic your talking patterns, eventually leading to a full conversation between both of ya'll.
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