If a very low defect (user interface) is detected by u and the developer not compromising with that defect,what will u do?

User interface defect is a high visibility defect and easy to reproduce.
Follow the below procedure
1. Reproduce the defect
2. Capture the defect screen shots
3. Document the proper inputs that you are used to get the defect in the defect report
3. Send the defect report with screen shots, i/ps and procedure for defect reproduction.
Before going to this you must check your computer hard ware configuration that is same as developer system configuration. And also check the system graphic drivers are properly
Installed or not. If the problem in graphic drivers the User interfaces error will come.
So first check your side if it is correct from your side then reports the defect by following the above method.