Snub (verb) UK /snʌb/ US /snʌb/
To insult someone by not giving them any attention or treating them as if they are not important.
Lawrence attempted to draw me into conversation, but I snubbed him, and went to another part of the room.
I think she felt snubbed because Anthony hadn’t bothered to introduce himself.
He denies that he is deliberately snubbing Owen.
His wife snubs him because he is friendly toward the female staff.
It infuriated him to be snubbed by a man for whom he had no respect.
Snub can be a noun.