We had the pencil case drama once 
Ds took a pencil case fully equipped. Checked every Sunday night together as he's autistic and very poor organisation.
Ds is an extremely kind hearted young man and also cannot stand up for himself. I thought he was losing pens but turned out he was lending them and peers refusing to return them at end of lesson.
I talked to him about this and tried to get him to say he didn't have spares etc. He tried but the kids would just take them.
We looked and found some lovely non removable stickers and for his initials on some and labelled it all. (This was after a day a teacher rang to say ds pen broke and he should have had spares and I explained he did but kids wouldn't return them - teacher said I had no proof - despite all pens being identical to the one he broke 🤦🏼♀️🤷♀️).
All sorted and ds kept 2 in pencil case and rest in locker.
Cue next week when I get a shitty email from same teacher that ds refused to share his pens and he wasn't helping his peers and needs to learn 
My email was very polite in response suggesting she challenged the kids for not bringing theirs and if she'd supported ds getting his stuff back previously he may have happily upheld the schools values (her complaint was it was against them refusing to help his peers when he has spares) and I'd expect it was the last of hear from her unless it was ds himself who was disorganised and I'd assume she'd be suggesting other parents dealt with their children!
I have no idea what her issue was but she just didn't like ds and found fault in everything he did. Best day ever on results day when he collected her subject result (she'd told him he'd fail because he had poor social skills) and he got 2 9's 
I'm all for rules and expectations but when he could have gone to locker to get them or they should be making reasonable adjustments due to send and just don't I have zero patience. I'll support a school 100% but only when reciprocated.