Is it normal in the western/euro pointing index finger to the older colleague?
In the UK this would be rude and unproductive. It may be tolerated to an extent as being humorous, but only if all parties felt this way.
So, what should you do?
I think that, if you are his manager, then you need to have a serious talk with the junior about their behaviour. You need to emphasise that if this is not done, then the junior will be let go.
In the Performance Improvement Plan, you need to address:
- Hours worked
- Quality of work
- Attitude to work
I recommend this approach because I advocate firing someone only if 2 conditions hold. They are both incompetent and have a lousy attitude.
If you are not the junior's manager, you need to raise all of these issues, with documentation, to their manager.
The evidence matters in both cases. If you can quantify lost hours of productivity from tardiness, hand holding and their bullying ways, then you have a better basis for letting them go if they don't improve.
Regarding what evidence needs to be collected, your company may have guidance on how to write a Performace Improvement Plan, or you may want to discuss it with your manager or HR.