Be beside the point
Definition 1 of 1
Pro Tip 1/3Topic Relevance
Use when pointing out that something doesn't relate to the main subject being discussed. 
You're talking about his past, which is beside the point; we're discussing his current proposal.
Pro Tip 2/3Argument Clarity
Helps clarify that certain details don't affect the strength or validity of an argument. 
His political views are beside the point; the data he presented is what matters.
Pro Tip 3/3Distraction Avoidance
Alerts listeners to ignore distractions and focus on the main issue. 
Your criticism of her dress is beside the point; let's concentrate on her speech.