This is just one example when the things go ugly. In the case that you bump into a similar issue with some fresh group, I think you might reconsider your membership and join with some other groups that can offer you much more.
I will give you just a few great examples aside from my own 
Short and ugly version of an incident:
- I joined the group's server
- I joined the group's voting trail
- After only 2 days I saw that group is not my cup of tea
- I informed the admin that I am leaving
- I left the server and unfollowed his trail
- The next day an admin used a group account, posted a reply to my comment on another person's post and called me a racist.
Basic code of conduct, according to us all, correct??
If the members did not receive the financial loan from a group nothing makes them obligated to stick with the program.
Anyone can choose any trail or group they like based on their personal preference. Reason to stay/leave should not concern the admin.
If a member is in clear violation, inactive for a prolonged period of time, behaving like an idiot, disturbs people - yes, an admin can/will kick/ban him just like that.
Once out of a group admin should not harass or spam ex-members across the Steemit unless in order to inform others of the potential danger of the fraud, violations and/or the harmful violent behaviors.
Well, wrong. Some special people think that you owe them just because you were polite to them.
Best practice ... is... whatever you think it is the best for you.
I usually just walk away, block, mute, rinse, repeat.
I might say something, but usually I do not say a thing. That's why you will find many things said, but zero damns given in return.
I wanted to post about this not because what he done in my case, but what the same person might do about you leaving his server or a trail.
Take care folks, keep your emotional weapons loaded, your eyes on the prize, your hands busy and stay away from the haters.
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