Yeah, 10% is really low. I usually judge people based on how they treat the service industry. Tipping is no skin off my back because I can afford it, especially with my baseline of 20%. It's rare that I get treated poorly by staff. I've definitely lost my patience before, but even then 20% is 20%. They might really need it and is having a bad day. The service industry and any job having to deal with customers all day is ruthless.