Tipping is a common practice in the service industry, and while it is not necessarily rude to not tip a valet attendant, it is generally considered a polite and respectful gesture to do so.
Valet attendants are typically paid a low hourly wage and rely on tips to supplement their earnings.
If you choose not to tip a valet attendant, it is not necessarily rude, but it may be perceived as a lack of appreciation for their work. However, there may be circumstances where it is appropriate to withhold a tip, such as if the valet attendant provided poor service.
Tipping is a personal choice, and you should only tip what you feel comfortable with. If you do choose to tip, a general guideline is to tip about $5 per vehicle, but you may want to consider tipping more for exceptional service or for larger or more complex parking jobs.
Based on more than 1000 events that we serviced in Los Angeles County here is a fun fact: generally the best tippers are older men and the worst tippers are younger women.
The worst average tip was recorded in 2016 at then Democratic presidential candidate Hillary Clinton's fundraiser that was attended by women only. The average tip came out at less than $1 per car.
The most generous tips are usually received at events taking place at golf and country clubs that are attended by men of conservative views.
Contrary to many people's assumption most celebrities do not tip well. Perhaps, that's a topic for another post.