Then get a divorce or let this fester and get a divorce later.  But my advice is when you finally get into a relationship with someone else, then **don't** tell them what the snake really represents because every man you date would have the same insecurity, unless maybe they are the same size or bigger.

Just to be clear, no SO wants to see your ex-BF's dick snake tattoo while having sex with you.  Listen to what Reddit is telling you. You are being unfair to your husband.