Wow, how can I explain "give you a hard time" in detail? I assume they will speak to you harshly and ask you if you meet the residency requirements and why you have let your PR card expire for so long. Then you tell them that you meant to renew your PR card but something went wrong with your first application and you haven't gotten around to renewing it but you do meet the residency requirements. Then they might say you should always have a valid PR card when travelling bla bla. and in the end, they still let you enter.