The difference is in whether we feel a genuine desire to clap, or only clap due to our wanting to follow the general social rule so that our goals will not be compromised due to ostracization for not following the rule.
Either one could be taking place at any one time, but, even when the former occurs, it's likely due to Fi (not Fe), and, when we do the latter, we, as uumlau said, try to feign Fe (or Fi) using our Te.
In certain circumstances, however, perhaps under the influence of certain drugs, or for an INTJ who actually happens to genuinely use Fe (which I believe is very
rare), we may actually use Fe in this scenario.
I just don't think that's true in the vast majority of circumstances.