“Like I said” usually means you didn’t say it clearly the first time.

Repeating yourself with an edge on it blames the listener for a problem you probably created. If something genuinely landed, it rarely needs a second airing, and the reflex to point out that you already covered it is mostly irritation at having to do the work again. The second attempt is also where you find out your first one was vague.

When you catch yourself reaching for that phrase, drop it and just say the thing differently. Shorter, with the point first. If two people needed it twice, the sentence was the problem, not their attention.