To be honest, yes it's normal for law firms. Not all law firms, but many.
I did a traineeship about 15 years ago in a large, old-fashioned but well-regarded firm with high net worth clients. Honestly, it was wild.
Sexual advances constantly, and being expected to be eye candy
Training consisted of photocopying for literally days on end, with the odd court appearance thrust upon you - the absolute shit that no one else wanted. No preparation or instructions and about 5 minutes notice
Driving partners to and from golf clubs, lunches, etc
Collecting dry cleaning, taking shoes to the cobblers, sent on errands to buy all sorts of random stuff and deliver it elsewhere, absolutely not work-related
Working the phones and estate agency when everyone else was too busy/out for lunch
Pouring drinks and serving food at the monthly parties
Being groped, felt up, having to smile and be accommodating to clients etc. I remember someone about 30 years older than me saying he had something for me in his pocket, and I had to reach in to get it. This was in front of a load of partners smiling encouragingly, so I just did it. It was his hotel room key. Yuck. All because I'd made smiley polite small talk with him at a works do.
The girls were groped and the boys were pranked. We were phoning and phoning one guy because he had a court appearance he was missing. He'd been at the office drinks the night before. When he answered the phone he was shoeless in a field about 10 miles out of the city, having been left there pissed by some of the partners.
I made some amazing friends there but it was fucked up. I now work somewhere that values it's trainees and tries very hard to ensure they learn what they need to during their time.