The phrase "a bit of abuse" is correct and usable in written English.
It can be used to describe a small amount of mistreatment or harsh treatment, often in a figurative sense.
Example: "While the criticism was harsh, I felt it was just a bit of abuse rather than a serious attack on my character."
Alternatives: "a little mistreatment" or "some harshness".
The situation engendered a bit of abuse and minor epithet-swapping.
I was warming up as a substitute at a ground in the north-west and I got a bit of abuse, got called a few racist names.
To those who abused me, well, I never lose sleep over trading a bit of abuse, though I try not to raise the temperature any further.
6.53pm GMT Crosby is suffering a bit of abuse at the hands of the Norway defence (imagine me pronouncing this DEE-fence) and getting inadequate protection from either his team mates or the officials.
"I had never seen, even in the years of New Labour when because I was neither a Blairite nor a Brownite I tended to be at the receiving end of quite a bit of abuse, the sort of briefing and sniping that was going on a couple of weeks ago.
"Unfortunately, a few people were giving Richard a bit of abuse, which I thought was unjustified".
He said that he had been given a bit of verbal abuse by the locals and that he found it quite funny.
She was waving her arms about, and giving a bit of racial abuse – but that's just the easiest thing to do when you feel like that.
Never mind that it's been dubbed "Oldchella," any event featuring the likes of The Rolling Stones, Bob Dylan, Paul McCartney, Neil Young, Roger Waters (of Pink Floyd) and The Who is worth a bit of ageist abuse.
They typically involve hurling a bit of verbal abuse at the candidate, staring at them silently, and even making them wait long times before being seen.
"We hired one to a company in Inverness and they said they were getting a fair bit of abuse after we beat Ross County," Bowie said.
