Nope, being reactionary means that your actioned and/or opinions are reactions to the actions/opinions of others rather than proactive ie what others react to.

Being regressive, on the other hand, means wanting to regress to a previous state, such as wanting to roll back social progress or otherwise return to how things used to be.

MAGA being a classic example of revisionist regressive ideology pretending that everything was better back when minorities and other vulnerable groups of people didn’t have as many/any rights.