Re: verbal abuse from a teacher
Verbal abuse is not to build character, it is to break character. Think army drill sergeant. Why do drill sergeants act the way they do?
First break you down and then build you up to be a soldier.
To some extent this goes for martial arts to.
In Aikido I think this is very much out of place.
Think deeply about why you would want stay with this teacher. Is he that good? Or is the dojo conveniently 'there'? If you cannot find a (very) good reason to stay, leave immediately.