I'm bald (I'm also old and weak). If someone tries to insult me by calling me bald, the "bald" comment doesn't bother me, but...if it's obvious that you are trying to insult me, that informs me about your perspective and frame of mind.
A personal attack is often the sign that the attacker realizes their argument is weak and unpersuasive. Doctor bass is a long-time poster and respected member, and specified that the batteries in question were for local pickup only. The potential buyer "attempted" to make a personal insult at Doc, and that is the basis for the one-week ban. If you run an EV forum, you want Doctor Bass to post there, and you do not want sketchy buyers like this throwing manure at the fan. He is being given an opportunity to thoughtfully review his actions.
Everyone is welcome to make a bold statement, and also present an argument as to why a certain idea is worth considering. However, if someone else attempts to refute that position, they will be moderated...IF...the counter-argument becomes a personal attack. Discuss ideas, do not make personal comments.
Fascism is when the encompassing authority only allows one opinion to be expressed (the opposite of fascism is freedom of speech). When someone disagrees with you, it is not fascism, both of you are allowed to express your reasons for presenting an opinion on the subject at hand. In an open society, a member is allowed to state that the sky is green and the grass is blue. Each reader is allowed to determine for themselves if the stated subject at hand is worth consideration.
On the other hand (OTOH), forums that are heavily moderated have a less open and vibrant discussion of any idea. An example is how there are members on ES who have very strong opinions, and they may express their opinions in a very crude and abrasive way. Some very useful data comes from people that may be hard to read without cringing.
If your technical argument has merit, trust the readers to recognize that. But...no personal attacks. Every forum has to draw a line somewhere. I occasionally defend someone I might not agree with on a certain subject, because I am trying to avoid becoming a fascist.