He might be threatened by yourself. Remember that technology moves at a fast pace - particularly with front end web development - so the bread and butter skills

He might be threatened by yourself. Remember that technology moves at a fast pace - particularly with front end web development - so the bread and butter skills he learned might have been deprecated with the tools that you now consider to be bread and butter. In which case he might still be capable but feeling insecure and just needs some patience and handholding. So the best thing to do in those situations is exactly that - show a little patience. Work with him. In time you will either earn his respect (remember it does have to work both ways) or in the worst case you'd have gained enough experience handling him that you'd be ready to progress to your next role as a senior engineer. Perhaps even both. Plus in the process he might even surprise you by demonstrating that he's not so useless after all and in fact his blindspots aren't an inability to grasp simple logic but rather just gaps in knowledge for one specific framework amongst a wealthier repertoire of skills that you are yet to discover. This is a little like the problems hiring managers face when trying to separate out those who are confident but lack skill and those who are confident because they are skilled. Or even telling apart people who are confident because they think they know what they're doing from those who do know. So maybe think about this as improving your none-technical career building skills?