I got sued by former employer for non compete. I dint carry any trade secrets nor did I spoil any business relationships.

You need to respond. If you do not, you will have a judgment against you.  If the employer has no damages, the case will probably just peter out if you respond.

I'm not sure what your question is, but absent a contractual non-compete, a former employee has no obligation not to compete with his former employer unless the employee misuses the employer's property, including proprietary information (which could include a customer list)to do so.  Did you have a non-compete agreement?  Even if so, this may not be the end of it since such agreements are not always enforced by the Courts.