I don't consider playing standards to be lazy or bad in and of itself, but when you revert to them due to not learning other material, then it is. For example, you plan out 2-3 new songs for your next gig that you know will go over well at the venue. But, when you get there, you realize the guitarist didn't learn the tunes, so you revert to the tunes everyone knows.
I have full time job in IT, own a business, have a family, am the guardian of my autistic brother, involved in my church, go to the bar on Sundays watch copious amounts of football in the fall, etc. but am still able to spare some time in a 1-2 week period to learn a few tunes. I know musicians who have a fraction of what's on my plate who can't put in the time to learn a tune on their own. If I can get the time to learn a few tunes, then anyone can. It's really not that hard. I don't know 10,000 tunes, but I have performed over 700 different tunes in the last 4 years.
Northern Virginia is a crazy busy place where it's hard to synchronize schedules so its important to learn the material on your own prior to rehearsal or gig. If you're not prepared, you are wasting others time. I really don't have time for rehearsals, so I don't do them often. I listen to material while working or in my car. I chart out a tune, and practice in the wee hours of the night after my other work is done. I can't tell you how many times someone has come in to rehearsal without having heard the song, which is utter laziness in this day and age, IMO.