It would never be okay to send your boss that type of response. It's all about texting etiquette.. and well, texting back, "K" or "Txt you later" isn't it chief.
Answer:
It probably isn't good to send K, BRB, LOL stuff like that to a boss, because usually those K, BRB, LOL are usually used for texting for fun, you better not use k, brb, or lol when you are texting with someone important...! lol
