How to Negatively Impact Employee Engagement

Don't Acknowledge Employee Successes
If you're always focused on what the employee hasn't done or what they made a mistake on then don't be surprised when you get a resignition letter from a good employee. Employees can only take so much beat down before they start to look for new and better opportunities. If they don't feel appreciated for their hard work and accomplishments they're not going to stay longer than they have to. Make sure you notice their efforts or you'll be sorry you hadn't.

Ignore High-Performing Employee Policy Violations
If you're not discipinilng employees equally then people will get a bad taste in their mouth. You may not think it's obvious but employees are always listening to and watching what you do. You'll lose respect as a manager and as an employer if you fail to treat all employees equally

Cut Back Bonuses but Openly Discuss Purchases and Vacations
Sure, as an employer you have a right to conduct layoffs, reduce hours, reduce bonus payouts and administer pay freezes. However, if you're doing these things but are openly discussing your lavish vacation plans and new Mercedes purchase then you're unknowingly creating negative attitudes in your workplace. Employees will not only resent you but you'll lose respect as well as trust.

Treat Certain Employees As Favorites   
When you always make an effort to talk to Amy Smith but overlook other people you're showing your team that you have an obvious favorite. If you make effort to give them praise but rarely any one else then people start to feel overlooked and undervalued. Make effort with all employee's regardless of who may be your favorite.