1- They correct your grammar or spelling errors when there is no need to

2- They use strange, uncommon terms to pretend that the culture is wide

3- They only talk to you in areas that you do not know about, so that you do not discuss with them the validity of what they say

4- They refuse to change their idea even after they are proven wrong with the evidence

5- They attack your person instead of discussing your ideas

6- They claim that the skills or knowledge they possess (may be their scientific specialization or their work) are more important than the field of knowledge of others.