This is a bone of contention.

Meaning

This is a subject of dispute or disagreement.

Examples

• John: 'The budget allocation is always a contentious issue.'<br>
• Alice: 'Yes, <b>this is a bone of contention</b> every year.'
• John: 'I suspected as much; <b>this is a bone of contention</b>, I see.'
• Alice: 'The new office layout has caused friction among the team.'<br>