Yes, I used to say these phrases a lot as an arrogant immature child. Yes, it is impolite, on a similar level to "whatever!" and "so what?"

Both phrases—“for all I care” and “as if I care”—can indeed sound rude or passive-aggressive, depending on the context and tone in which they are used. They are often employed to dismiss or show indifference toward something, so they might not be suitable in polite or casual conversation unless you're intentionally trying to convey those feelings. 1. “For all I care” - Usage: This phrase is used to express indifference or lack of concern about something. - Example: “They can go ahead with their plan, for all I care.” - Tone: It can come across as dismissive and might be perceived as cold or uninterested. 2. “As if I care” - Usage: This phrase is typically used sarcastically to show that you don’t care about something, often in response to someone suggesting that you should. - Example: “He thinks I’m going to help him again? As if I care.” - Tone: This phrase is usually more sarcastic and can be perceived as even more confrontational or rude. Alternatives for Polite Conversation: If you want to express indifference without coming across as rude, you could use gentler phrases like: - “It doesn’t really matter to me.” - “I’m not too concerned about it.” - “That’s not something I’m worried about.” Using these alternatives can help you avoid any unintended negative tone.

You can use these expressions with no fear. Whether or not they are rude depends on the circumstances, and most of all your tone. People read your meaning from manner, voice, and tone more than from actual words spoken. Your eyes say more than your mouth. Speak sincerely. Look people in the eye. They will know whether or not you intended to be rude. Here's an example of "for all I care" that cannot possibly be considered rude: "I have looked forward for a long time to today's hike. There are some dark clouds in the sky but for all I care, let it rain! I'm prepared with my poncho and waterproof shoes."