If more variants will keep happening because of mutations, it means there's some human error in the vaccine or the boaster in the first place
As Ultegra134 said, this is not correct. Mutations always occur in any living thing, it's a result of copying errors during cell replication. Mutations can help the organism to survive, or hinder it, or neither. If a mutation helps the organism, then this causes the mutation to survive and pass to future generations - this is the 'natural selection' element of evolution.
Vaccines can't
stop mutation, nor are they intended to. But vaccines do reduce the amount of mutation in the sense that they reduce the amount of virus in circulation, and so they reduce the amount of cell replication in total.
if the vaccine or the boaster was indeed the solution to covid-19/omicron there's no reason for the vaccinated people to be afraid of the unvaxxed.
Vaccinated people aren't scared of the unvaxxed. The antipathy stems more from the unvaxxed appearing to have a very low level of empathy, because they are willing to spread the virus and infect others. I've compared it to drink-driving before, and I think the comparison is valid.