If my son came back from school two days in a row telling me that he had to "write his name a lot", I'd ask him the following:
- How many times is "a lot"?
- Why did you have to write your name so much? Was everybody else writing their names too (class activity)? Or was it just you (punishment)?
- Did you show your work to the teacher?
Then, depending on the answers, I'd maybe, maybe not talk with his teacher.
- If "a lot" means like 5 times... "Come on, son, don't be whiny. 5 times is not a lot. Just make sure you do your best and show the teacher how well you did it!".
- Beware, however, that writing your name 10 or more times, when you are still learning to write (and spend like 5 seconds per letter), is a big deal. A kindergarten kid can easily spend 15 minutes or more just trying to write "Billy" 10 times. And that's indeed "a lot" for them.
- If it looked like some kind of punishment, I'd ask the teacher about how my son is doing in class, whether he's behaving fine or not, and how can I help in his development and behavior.
- If it looked like a class activity, I'd tell the teacher that I already taught my son how to write his name, but I'd show interest in how he did it this time in class. If he did it well, I'd explain how it's frustrating to him to repeat something that he already does fine, and ask the teacher about the possibility of my son writing something else instead (like the teacher's name, or the school's name), or maybe using different colors each time, or cursive. If he can improve, then I'd thank the teacher for their work and encourage my son to improve.
The above has the benefit of you making your son rationalize about the activity, and you showing the teacher that you want to be involved in your son's learning process.
In my opinion, a good teacher / school should try to adapt the activities to each children's capabilities, as much as possible within the school's program and the general level of each classroom. They're supposed to educate humans and to instill in them the passion for learning; not to program them like drones.
EDIT Re: comments about acknowledging a child's feelings.
@AquariusTheGirl @theonlygusti Your comments are welcome.
I do not agree with the current trend of validating every single feeling a child might have. I think it leads to entitled adults who think that their feelings are above everything else, adults who think they have the right not to be hurt or offended, ever.
There's a difference between acknowledging a child's feelings ("I understand how you feel and why you feel like that"), and telling them it is OK to feel like that when it isn't.
It is OK to feel hurt when someone insulted you. It is OK to feel sad when your friend moves to another town. It is OK to feel anger when you see someone abusing somebody else.
It is not OK to feel envy of your friends toys. It is not OK to feel rage because you didn't get cake for dessert. And it is not OK to feel apathy because you had to write your name 5 times back at school.
Sure, it's not easy for a child to discern when it is OK to feel some way, and when it isn't. That's why we parents are here: to help them learn.