No, YANBU to ask for tolerance of new drivers; they're learning, mostly they drive carefully and within their limits. No issues with them at all.
However, some of the supposedly experienced and competent people in the passenger seat accompanying learner drivers need to take a look at themselves. I had the misfortune to be driving behind a learner not so long ago, in what passes for the rush hour in these parts - sleepy little town, but two primary schools, and a busy level crossing which closes every ten minutes or so. In the space of less than 200 yards, he'd blocked a roundabout by not checking his exit was clear, driven through a red light on a pedestrian crossing, and turned into a side road without signalling, slowing down or (apparently) looking. He slammed on the brakes inches from the parent (who had right of way) crossing the road with his DC.
He parked up, I parked up, and off he went to his train. His mother (who was the accompanying experienced driver) must have seen me looking like
because she started gushing to me about how good I'd been not to hassle him, he wasn't really ready to be driving but he wanted to learn so much, he was so confident, he'd always been a confident child, she didn't think that we should hold back our children, should we, and it'd be so convenient if he could drive by the time he went to uni. I managed not to slap her, but she got the Hard Stare, and was told that he was a fucking danger on the road, no matter how confident he was.