why do ppl get so annoyed that i don't use capitals?

my teachers always told me i don't have any self-esteem because i write my "i"s in lowercase. but anyone who knows me even faintly well can tell them that's so not true because my ego is bigger than the grand canyon.

my friend hates it that in my phone book on my phone i don't capitalize names. she says something about how it commands respect for other people when you do it. (i think she got that from a story about a rabbi who had everyone in his phone book written with R' in front of it, or something)

but it's such a waste of time to capitalize names and the beginning of sentences.